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Harris Geospatial / Docs Center / IDL Reference / I/O - HDF / HDF_VD_ATTRINFO

HDF_VD_ATTRINFO

HDF_VD_ATTRINFO

The HDF_VD_ATTRINFO procedure reads or retrieves information about a VData attribute or a VData field attribute from the currently attached HDF VData structure. If the attribute is not present, an error message is printed.

Examples


For an example using this routine, see HDF_VD_ATTRSET.

Syntax


HDF_VD_ATTRINFO, VData, FieldID, AttrID [, COUNT=variable] [, DATA=variable] [, HDF_TYPE=variable] [, NAME=variable ] [, TYPE=variable]

Arguments


VData

The VData handle returned by a previous call to HDF_VD_ATTACH.

FieldID

A zero-based index specifying the field, or a string containing the name of the field within the VData whose attribute is to be read. Setting FieldID to -1 specifies that the attribute to be read is attached to the VData itself.

AttrID

A zero-based integer index specifying the attribute to be read, or a string containing the name of that attribute.

Keywords


COUNT

Set this keyword to a named variable in which the number of data values (order of the attribute) is returned.

DATA

Set this keyword to a named variable in which the attribute data is returned.

HDF_TYPE

Set this keyword to a named variable in which the HDF data type of the attribute is returned as a scalar string.

NAME

Set this keyword to a named variable in which the name of the attribute is returned.

TYPE

Set this keyword to a named variable in which the IDL type of the attribute is returned as a scalar string.

Version History


5.5

Introduced

See Also


HDF_VD_ATTRFIND,  HDF_VD_ATTRSET,  HDF_VD_ISATTRHDF_VD_NATTRS



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